#108 MVP: derive a hyperelastic material from its energy potential - #117

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feature-material-compiler-mvp

Commits on Jul 23, 2026

#108 MVP: derive hyperelastic material from energy potential (add_hyperelastic_potential: S=dpsi/dE, tangent=d2psi/dE2)
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Commits on Jul 24, 2026

#108 review: derive strain name from handle (drop desyncable arg) + reject strain-independent energy/non-input strain + rollback on throw; non-constant + major-symmetry e2e + negative unit tests
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#108 2nd-pass review: reject state-variable strain (real silent-wrong bug) + test; add minor-symmetry check (the load-bearing property); dial back overstated major-symmetry/dependence-guard claims …
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#108: close the non-symmetric-leaf test gap — NonsymmetricFromEnergy (psi(F), roles::DeformationGradient) FD-verified + tangent major-but-not-minor-symmetric (also proves minor_symmetric() discrimi…
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Commits on Jul 25, 2026

#108: check tangent symmetries with tmech::basis_change (pair-swap permutations) instead of hand-rolled index loops
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